How to make automatic ON OFF street light No LDR, using LED instead of LDR
A photoresistor is a component whose resistivity depends on the ambient luminosity. Simply put, it's a resistor whose value changes depending on the light it receives.
There are different types of photoresistors, each with different resistance values depending on the ambient light. The most common type of photoresistor is 1M ohm (dark) / 12K ohm (full light). It is this kind of photoresistor that is used later in this tutorial.
It does not matter the diameter of the photoresistor, its value in the shade or in full light, when a photoresistor is illuminated, its resistance decreases. We can therefore use a photoresistor to measure the ambient luminosity.
Without making an exhaustive list, here are some examples of very classic uses for a photoresistor:
Day/night detection,
Ambient light measurement (to adjust lighting for example),
Light tracker (for solar panels, robots, etc.),
Many Arduino projects and smart objects need to adapt to their environment...to provide smart service. For example, objects, robots or projects can be made smart by making them adapt to ambient light.
If an electronic system has an LCD screen, and it runs 24/24, it may be interesting to turn on the backlight of the screen only if the ambient light falls below a certain threshold.
To simply add this functionality to one of your projects, you can use a simple light sensor and have it trigger a lamp to turn on. The sensor is actually a photoresistor, or LDR (for Light Dependent Resistor). This component is a variable resistor, the resistance of which drops with the light intensity for the vast majority of them.
We will show you in this tutorial how to control, using an LDR photoresistor, a lamp with an Arduino circuit so that it turns on automatically when the brightness drops below a certain threshold.
How to make automatic ON OFF street light No LDR, using LED instead of LDR
A photoresistor is a component whose resistivity depends on the ambient luminosity. Simply put, it's a resistor whose value changes depending on the light it receives.
There are different types of photoresistors, each with different resistance values depending on the ambient light. The most common type of photoresistor is 1M ohm (dark) / 12K ohm (full light). It is this kind of photoresistor that is used later in this tutorial.
It does not matter the diameter of the photoresistor, its value in the shade or in full light, when a photoresistor is illuminated, its resistance decreases. We can therefore use a photoresistor to measure the ambient luminosity.
Without making an exhaustive list, here are some examples of very classic uses for a photoresistor:
Day/night detection,
Ambient light measurement (to adjust lighting for example),
Light tracker (for solar panels, robots, etc.),
Many Arduino projects and smart objects need to adapt to their environment...to provide smart service. For example, objects, robots or projects can be made smart by making them adapt to ambient light.
If an electronic system has an LCD screen, and it runs 24/24, it may be interesting to turn on the backlight of the screen only if the ambient light falls below a certain threshold.
To simply add this functionality to one of your projects, you can use a simple light sensor and have it trigger a lamp to turn on. The sensor is actually a photoresistor, or LDR (for Light Dependent Resistor). This component is a variable resistor, the resistance of which drops with the light intensity for the vast majority of them.
We will show you in this tutorial how to control, using an LDR photoresistor, a lamp with an Arduino circuit so that it turns on automatically when the brightness drops below a certain threshold.
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